Goodwill and Other Intangible assets, Net Intangible Assets Not Subject to Amortization (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Apr. 30, 2014	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2014
Indefinite-lived Intangible Assets [Line Items]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)				$ 1	$ 7	$ 7
Trademarks
Indefinite-lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)				$ 21	$ 19
Brazilian Reporting Unit [Member]
Indefinite-lived Intangible Assets [Line Items]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 1	$ 3	$ 7
Indefinite-Lived Intangible Assets (Excluding Goodwill)		$ 24	$ 43